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F Theta Scanning Lens are commonly used in conjunction with galvanometer scanning mirrors in laser engraving, cutting, and marking systems. The reason it being named as F theta is due to the radial image height equals to focal length of the lens multiplied by the angle of the chief ray makes in the object space. Hence, from the image height, the distortion of the image can be calculated at each field of interest. Typically the F theta distortion of this lens is kept less than 1% so that it produces a precise spot on the flat field on image plane.
In a typical scan lens configuration, the F-theta lens is used with one or two axis galvo mirrors that enable the laser beam's fast positioning and precision focusing.
While standard focusing lenses deliver a focused spot to only one point, scan lenses deliver a focused spot to many points on a scan field or workpiece. They require special considerations in their design and use.
The Single-chip Flat-field Scanning Mirror of UltiQuest has optimized the wide-angle and long focal-length light path, it is widely applied in wide scan range situation.
 Standard Specifications:
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Optical Material:
Diameter Tolerance:
Design Wavelength:
Design Index:
Paraxial Focal Length:
Centration:
Clear Aperture:
Surface Quality:
Wavefront Distortion:
Bevel:
Coating: |
Laser Grade CVD Zinc Selenide
+0.0, -0.13mm
10.6um
2.4028 at 10.6um
±2%
3 arc minutes
>85%
40-20 scratch and dig
lambda/2 at 632.8nm
<0.25mm X 45°
AR/AR Coated R<0.5% at10.6um |
Standard Single-chip F-Theta lens for CO2 Laser:
Dia(mm) |
Scan Scope |
Focal Length(mm) |
Incident Light(mm) |
Max.IOA
(Degree)
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Wavelength
(μm) |
Product Number |
48.00 |
70*70 |
101.39 |
14 |
30 |
10.6 |
UQT-SFLZ0601 |
48.00 |
110*110 |
149.10 |
14 |
30 |
10.6 |
UQT-SFLZ0602 |
48.00 |
175*175 |
249.40 |
14 |
30 |
10.6 |
UQT-SFLZ0603 |
48.00 |
200*200 |
298.00 |
14 |
30 |
10.6 |
UQT-SFLZ0604 |
48.00 |
300*300 |
432.70 |
14 |
30 |
10.6 |
UQT-SFLZ0605 |
48.00 |
400*400 |
591.70 |
14 |
30 |
10.6 |
UQT-SFLZ0606 |
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| Please Contact ultiQuest for other dimensions in prototype and production quantities. |
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| NOTES! |
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ZnSe reacts readily with acidic substances, generating toxic selenium oxide gas. Never clean with acidic washing solutions. |
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Note that ZnSe is classified as a toxic material by law. Transactions involving ZnSe or products incorporating ZnSe require a certificate of transfer. |
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Disposal of ZnSe optics as general waste is prohibited. Please notify us if you need to dispose of such products. (Ultiquest Technolgies products only.) |
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Be sure to wear laser safety goggles when checking optical path and adjusting optical axis. |
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